MIXING DEVICE AND BURNER HEAD FOR A BURNER WITH REDUCED NOX EMISSIONS

摘要

In order to further reduce NOx emissions, the invention provides a mixing device (10) for a burner (16) with reduced NOx generation, comprising a centrally arranged first mixing device (18) for generating a first fuel-air mixture for a primary flame zone (120), wherein the first mixing device (18) has at least one first fuel nozzle (38) and one baffle plate (40), a second mixing device (20) for generating a second fuel-air mixture for a secondary flame zone (122) surrounding the primary flame zone (120), wherein the second mixing device (20) has multiple second fuel nozzles (70), characterized by a barrier air generating device (24) for generating an air barrier flow in an air barrier flow zone that surrounds the primary flame zone (120), arranged downstream of the baffle plate (40), of the first mixing device (18), wherein the second mixing device (20) is designed to discharge the second fuel-air mixture into the secondary flame zone (122) that surrounds the barrier air zone (126), and wherein the second mixing device (20) is arranged around the barrier air generating device (24), and by a third mixing device (22) which is arranged radially between the barrier air generating device (24) and the second mixing device (20) and has a swirler (76) and at least one third fuel nozzle (74) arranged upstream of the swirler (76) in a pre-mixing zone (78) through which a swirl air flow flows to the swirler (76) in order to premix, prior to swirling, fuel from the third fuel nozzle (74) with the swirl air flow.